11 



15. a. Cyc. orhicularia Barrat. 



15. b. Cyc. mirabilis Prime. . . 

 15. e. Cyc. coeriilea Prime,. . . . 

 15. d. Cyc. eburnea Anthony.. . 



16. Sph. Jayanum Prime. 



1 7. Sph. tenue Prime. 



18. Sph. transversiim Say . . 



18. a. Cyc. detruncata Prime.. . 



1 8. b. Cyc. gracilis Prime 



18. c. Cyc. constricta Anthony.. 



19. Sph. contractum Prime. 



20. Sph. securis Prime. 



20. a. Cyc. cardissa Prime, 

 20. b. Cyc. crocea Lewis. .. 



21. Sph. rosaceum Prime 



22. Sph, sphaericum Anthony, 



23. Sph. truncatum Linsley. 



28. a. Cyc. calyculata C. B. 

 Adams 



24. Sph. lenticula Gould . . 



25. Sph. maculatum Morelet. 



20. Sph. meridionale Prime... 



Middletown, Conn. 



ex auct. 



Georgia, 



Cambridge, Mass. 



Arkansas. 



ex auct. 

 .Lake Superior region. 



Fort Pierre. 



Montreal. 



.Androscoggin, Me. 

 .Herkimer^Co., N. y. 



Erie Canal ; Canada ; 

 Pennsylvania; New 

 Harmony, Ind. ; 

 Wabash river, 111. ; 

 Arkansas. 



Schuylkill river, Pa. 



Ohio. 



Ohio. 



ex auct. 



.Big Prairie Cr'k, Ala. 

 .Cambridge, Mass. 



Westfield, Ma s. 



Staten Island, N. Y. 



Tuscola Co., Mich. 



Oakland Co., Mich. 



Canada. 



Cambridge, Mass. 



Otsego Co., N. Y. 



ex auct. 



.Schuylkill river, Pa. 

 . Loraine Co., Ohio. 



ex auct. 



Black river, Ohio. 



ex auct. 

 • Greenwich, N. Y. 



Lake Champlain. 



Ohio ; Maine. 



Vermont. 



ex auct. 

 .Carson's river, Cal. 



ex auct. 

 .Yucatan. 



ex auct. 

 . Panama. 



